"When I removed the shaft, the differential dropped into my shoulder and dug in," he said. "I was on my side when I was removing the drive shaft, so I was pushed out the back of the truck. I was able to slide out before it dropped all the way down."

O'Grady sustained a broken shoulder blade, cracked ribs, muscle tears in both shoulders and a large cut on his back 5 to 6 inches wide.

"The laceration was from the differential digging into my back," he said. "I got pretty bad road rash on my head from where the tire scrapped across. I started screaming and then she (his wife) came over and I told her I'm not moving."

O'Grady said the truck's height was the only thing saving him from a brush with death.

"The height of the vehicle was high enough that it allowed the truck to move forward and go completely off me," he said.

Despite the close call, O'Grady said during the accident, he wasn't worried about dying.

"I could feel everything so I knew I was going to be okay; I just had to lay there until the ambulance arrived," he said. "I'm just really sore. I'll probably be out of work for about two weeks."